80
Stack Score
Best for
Developers building real-time voice agents and conversational products where sub-second latency is a hard requirement.
At a glance
- Pricing
- freemium
- Setup time
- 15 minutes
- Learning curve
- medium
- Last verified
- 5/19/2026
What we love
- ✓Lowest production-grade latency in the TTS space right now
- ✓Voice quality holds up against ElevenLabs at faster speeds
- ✓Streaming-first design fits voice agents better than batch APIs
Where it falls short
- −Smaller voice library than ElevenLabs or PlayHT
- −Pricing requires committing to a paid tier for production-grade limits
- −Less mature dashboard and analytics than incumbents
Pricing
✓ Pricing verified Jun 21, 20265 tiers
Free
$0
forever
- ✓20K credits for models
- ✓$1 prepaid for agents
- ✓Personal use
- ✓Discord support
- ✓Access to Sonic, Ink, and Line
Pro
$4
per month, billed yearly
- ✓100K credits for models
- ✓$5 prepaid for agents
- ✓Instant voice cloning
- ✓Commercial use
Startup
$39
per month, billed yearly
- ✓1.25M credits for models
- ✓$49 prepaid for agents
- ✓Pro voice cloning
- ✓Organizations support
Scale
$239
per month, billed yearly
- ✓8M credits for models
- ✓$299 prepaid for agents
- ✓Priority support
- ✓High concurrency limits
Enterprise
Custom
annual contract
- ✓Custom usage pricing
- ✓Custom concurrency
- ✓Enterprise support via Slack
- ✓SOC 2, PCI, HIPAA compliance
Why we picked it
If you're building a phone bot or live voice agent, Cartesia's latency is what you want.
Overview
Sub-100ms text-to-speech with voice cloning. Sonic and Sonic-2 models. Developer-focused API.
Key features
- ●Sonic and Sonic-2 — sub-100ms latency text-to-speech
- ●Voice cloning from a short audio sample
- ●Streaming API for real-time conversational agents
- ●On-device model option for low-latency local deployment
- ●Multilingual support with maintained voice identity across languages
- ●Built by ex-Stanford researchers — strong technical foundation
Best use cases
Phone bots
Power outbound or inbound voice agents where every 100ms of latency matters.
Real-time companion apps
Live voice interaction in apps like Sesame-style companions or AI tutors.
Game NPCs
Dynamic in-game dialogue voiced on the fly with consistent character voices.
Integrations
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